The present invention describes a water recirculation system intended for recycling of water or discarding of water not suitable to recycle, said water recirculation system (1) comprising a flow path for recirculation (50), at least one water treating unit (6), and a sensor unit (7) arranged for measurement of at least water quality, and wherein the sensor unit (7) is connected to a control unit which decides if water should be recycled or discarded in a point of separation (30) based on the measurement of the water quality, said water recirculation system (1) also comprises a first heating source (00), and wherein the water recirculation system (1) also comprises a second heating source (200).

The present invention describes a water distribution system 1 comprising a water supply, a heating source 100, at least one temperature sensor, a flow path for water with a user outflow UO, and a control unit for operation of the water distribution system 1 said temperature sensor being connected to the control unit, wherein the control unit also is connected to at least one presence sensor PS arranged for the detection of presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO and wherein the control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow UO based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO.

A heating system including a water conductor, a valve configured to cooperate with a fluid moving device which together operable to selectively circulate a heat transfer fluid in at least one of a first fluid circuit and a second fluid circuit, a heat exchanger and a blower operable to supply a stream of fluid over the heat exchanger, wherein the heat exchanger is fluidly connected to the first fluid circuit, wherein the heat exchanger being disposed to transfer heat between the heat transfer fluid and the heat exchanger, a coil fluidly connected to the second fluid circuit, wherein the coil is configured to be disposed on a drainage tube to transfer heat between the heat transfer fluid and the coil, a final heat exchanger configured for thermally coupling the first fluid circuit and the water conductor and the second fluid circuit and the water conductor.

A sanitizing system for sanitizing a water flow at a point of use, the sanitizing system including an ozone demand indicator configured for determining the existence of a demand for ozone in the water flow; an ozone generator configured to be disposed no more than about 72 inches upstream of the point of use on a fluid conductor supplying the water flow at the point of use, wherein ozone generated by the ozone generator is configured to be disposed in the water flow to sanitize the water flow; and a control device operable to control the ozone demand indicator and the ozone generator responsive to the ozone demand indicator, wherein the control device is configured to cause the ozone generator to start generating ozone upon receiving an indication from the ozone demand indicator that the demand for ozone exists.

A hot water supply system includes a water supply pipe for supplying cold water, a hot water supply pipe for supplying hot water heated by a hot water supply device, a drain pipe for draining wastewater, a heat exchange device for heating cold water supplied from the water supply pipe using the wastewater, and a flow control mechanism for controlling, when supplying warm water obtained by mixing cold water heated by the heat exchange device and hot water heated by the hot water supply device, the flow rate of the cold water and the flow rate of the hot water so as to maintain the temperature of the warm water. The heat exchange device is a double-pipe, multi-pipe, coil, or spiral heat exchanger.

A dehumidifier/cooling apparatus for use in a room having an elevated temperature and/or humidity is provided which utilizes the natural coolness of tap water to condense water vapor from the air or merely cool the air. The tap water line is diverted into a heat exchanger upstream of a hot water heater to dehumidify and/or cool the air in the room the air and remove the latent heat given off during condensation to cool and/or dehumidify the room air and to pre-heat the water entering the hot water heater. An air moving device powered solely by water moving through the tap water line directs a flow of air through the heat exchanger.

A first conduit having a cylindrical upper entrance region with the axis of the cylindrical region oriented vertically, which accepts incoming downwardly flowing hot drain water, a central region of said first conduit below the said entrance region having a conical shape of increasing diameter, reaching a maximum diameter 2-7 times larger than the upper region, the shape then transitioning to a decreasing diameter area of a conical shape, the shape transitioning to a cylindrical lower region with a diameter similar to the upper region diameter; a second conduit for the flow of the shower cold water supply, with a diameter 10-40 times smaller than the maximum diameter of the drain water conduit, and a length 10-40 times longer than the vertical length of the drain water conduit, the second conduit tightly wrapped around the first conduit and in close thermal contact with the first conduit.

An exemplary system is for a facility including a first heating/cooling zone and a water delivery system configured to deliver domestic water to a point of water use. The system generally includes a facility loop having a facility loop refrigerant flowing therethrough, a first zone heat pump configured to transfer thermal energy between the facility loop refrigerant and the first heating/cooling zone, and a first water-source heat pump configured to transfer thermal energy between domestic water upstream of the point of water use and the facility loop refrigerant.

An apparatus for heating water has a tank for storing water and an air conditioning system that defines a refrigerant flow path through which refrigerant flows. The refrigerant flow path passes through the heat exchanger so that refrigerant heat is contributed to the tank. A control system controls operation of the water heating apparatus.

A hot water unit fluid supply control system comprises a switching device coupled to a hot water unit, a rainwater tank and a potable water source. The switching device is configured to selectively switch between a first state, which allows fluid communication between the hot water unit and the rainwater tank, and a second state, which allows fluid communication between the hot water unit and the potable water source. The hot water unit fluid supply control system comprises a control unit configured to: receive fluid characteristic information associated with fluid in the hot water unit from one or more sensors; activate or deactivate a pump of the rainwater tank based on a comparison of a fluid characteristic parameter of the fluid characteristic information with requirements of the hot water unit to thereby cause the switching device to assume the first or second state.